The Dominion War was a conflict between an alliance of the United Federation of Planets and Klingon Empire with The Dominion and Cardassian Union.
In late 2374 the Romulan Star Empire and Bajorans joined the alliance, with the Breen Confederacy joining the Dominion in 2375.
United Federation of Planets Klingon Empire Romulan Star Empire
Dominion Cardassian Union Breen Confederacy
Second Battle of Deep Space Nine
Raid of Toros III
Battle of Betazed
Battle of Cardassia